Protocol stack encapsulation for voice processor

a voice processor and protocol stack technology, applied in multiplex communication, data switching networks, instruments, etc., can solve the problems of reducing the efficiency of voice processing, reducing the amount of material and labor required to install and maintain dedicated lines for each user, and affecting signal processing activities, so as to avoid interfering with signal processing activities

Active Publication Date: 2005-06-28
AVAGO TECH INT SALES PTE LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0037]A method for encapsulating voice telephony signals, involving reformatting voice data and implementing a protocol stack, is also disclosed herein. The method calls for the creation of a linked list of data structures and a set of header templates. Each data structure in the linked list contains a BMD and an associated memory buffer, and each BMD points to its memory buffer and to the next BMD in the list. The pointers in the BMDs allow a DMA controller to access the data contained in the memory buffers, and transfer it to another location without assistance from a DSP. This is beneficial, since it avoids interfering with the signal processing activities of the DSPs. An independent processor (the PCP) coordinates the movement of voice data by the DMA controller, so that data transferred to a new location are suitably arranged for transmission in a prescribed format. For example, after processing by a DSP, voice data samples received over a TDM connection can be transferred from DSP memory to a memory buffer associated with the PCP, and regrouped in the form of a TCP / IP packet payload.

Problems solved by technology

But as the number of users increases, the amount of material and labor required to install and maintain a dedicated line for each user quickly becomes prohibitive.
However, there is an undesirable characteristic of TDM, which potentially reduces its efficiency.
Consequently, a time slot allotted for a particular voice channel may go unused, if the signal source for that channel is inactive during its time slot.
For example, when sending an email message out over the Internet, it would be inconvenient to require the intended recipient of the email to have previously established a connection channel through which to receive the email.
The IP accounts for their delivery to the correct recipient, but does not manage the delivery sequence.
Unlike TCP, however, UDP does not provide the service of dividing a message into packets and reassembling it at the other end.
The consumption of power and space attributable to this aggregation of electronic devices is a serious problem.

Method used

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  • Protocol stack encapsulation for voice processor
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  • Protocol stack encapsulation for voice processor

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Embodiment Construction

[0046]Telephone voice signals originate in analog form, but travel relatively short distances before being converted to digital format, for transmission across high-bandwidth networks. To maximize the use of transmission media, such as wire, coaxial cable and fiber optic, multiple digitized voice signals are time division multiplexed (TDM) onto a single line. Throughout the telephone network, gateway sites manage this communications activity, providing signal processing, switching, protocol translation, etc. Given the high volume of voice data traffic, a great deal of circuitry is required to perform these operations. Therefore, the power efficiency and space utilization of the associated circuitry are highly important issues.

[0047]The transmission of digitized voice signals over a network requires that the voice data be formatted into discrete packets, prefixed with a header conforming to the network protocols. Preparation of the voice data in this manner is referred to as “encapsu...

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Abstract

A system and method are presented for the encapsulation of a protocol stack in a voice telephony processor. Utilizing the system and method disclosed herein, digital voice telephony signals received in TDM frame-based format are converted to packet-based or cell-based format for transmission on a network, and vice-versa. The system and method may be embodied as a functional block within a specialized high-density integrated circuit voice processor. The voice processor employs on-chip digital signal processors (DSPs) to perform echo cancellation, dynamic range compression/expansion, and other processing on voice data. Advantageously, the encapsulation process of the disclosed herein does not impact the throughput of the DSPs. Instead, voice data is reformatted and prefixed with a header for the appropriate protocol layers using a dedicated on-chip packet control processor and linked list data structures managed by indexed direct memory access (DMA) controllers. Thus, data encapsulation has no impact on the signal processing activities.

Description

RELATED APPLICATIONS[0001]This application is related to the following copending U.S. patent applications, filed on even date herewith: “Efficient High Density Voice Processor” and “Voice Processor with Memory Adaptable for Minimum Power Consumption” by Dan C. Vogel.BACKGROUND OF THE INVENTION[0002]1. Field of Invention[0003]This invention relates to integrated circuits (ICs) for voice communications, and more particularly, to a highly integrated processor for processing and routing voice traffic conforming to various standard protocols over a digital network. As disclosed herein, special memory management hardware associated with the processor efficiently implements protocol encapsulation, with minimal intervention on the part of the processor.[0004]2. Description of Related Art[0005]In its early history, voice communications consisted of analog signals transmitted over comparatively short distances. As telephone use increased and long distance connections became commonplace, it wa...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): H04J3/16
CPCH04J3/1617
Inventor VOGEL, DANNY C.
Owner AVAGO TECH INT SALES PTE LTD
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